r - rollapply mean 5 previuous years -

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i have zoo obj colled z.

> z["2013-12",1]        allerona

2013-12-01 0.0 2013-12-02 0.0 2013-12-03 0.0 2013-12-04 0.0 2013-12-05 0.2 2013-12-06 0.0 2013-12-07 0.0 2013-12-08 0.2 2013-12-09 0.0 ....

it stores daily value of rainfall.

i'm able compute 5-days accumulation using rollapply usingi:

m=rollapply(z, width=3, fun=sum, by=1, by.column=true, fill=na, align="right")

it looks ok

> m["2013-12",1] allerona 2013-12-01 0.0 2013-12-02 0.0 2013-12-03 0.0 2013-12-04 0.0 2013-12-05 0.2 2013-12-06 0.2 2013-12-07 0.2 2013-12-08 0.2 2013-12-09 0.2 ...

how can calculate each day themean 5-years before?

thanks

sma (x, n=5*365)

does not trick ?


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